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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47037832606bc23cffb76716588f081584f6d0ed0e24e0a7b520a8fdb6e2f69b' 
  AND token = 'g10yTAPFIliQmmOYxkQcQTk6H7VXlDWRKe4O+tNfzgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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