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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42932db98be5f1fb57aa90deed9e8e4f76f4c794217c56d41ee55cd8722245bf' 
  AND token = '/LO/H7Lmul+/RbrqUhiOntfhEZlXoCWU+vAX5MbuC4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}