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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb588ca6f4feccb2771ba297e7e9b0adc686830d380c72ad5a21ce7c21bdbdc' 
  AND token = 'qFKuZN88gRUAT8M5SQYu/yNUipRoxm6Jq6Pu4hYXfl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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