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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897cce14662a2a256384159b7c02b2a6d36ba619b9869b0ed01fa1b193138706' 
  AND token = 'Y8xTk21Ql/DScqbqsX3ggQ8hmaIZSn4r0m9hqJbj5m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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