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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6a18ac04ec923a15e9d552be077dfdee808bba4921018804e1b66d1e53c8c6' 
  AND token = 'xQv7nWk5sT7zJsJwN6IGko0Cs5GBESl4O2hGemJzQH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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