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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19534984704ab8ccceca3fbd8aafb08cd58a708f3ad34d13b30010a23a7185c' 
  AND token = 'XYySb/Cxq4RzxIp5ZVoZR+up7BnuqYsyjqChfNDt6Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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