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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ada9087f373c1c64d648458f55de8487e293cb87a44c8f125a9b190d3edb511' 
  AND token = 'xcwmV/3mlFd5DLdlGu4atzozJkDm5xpa50M2NqtIKQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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