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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60282080d1e21e56a6685790a9fc1426205276f793ab647fae22eec0661b75d' 
  AND token = 'KNXhk0erANwCTOq5JYP+cg8ohRuR/3wTNbh4qhO9aRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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