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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acdfc227a05781f5a0ef0bd41dd614604bb44e540121705a3faf99838745c4fe' 
  AND token = '6uUo7G5DI3C0o8CuFTtmv198ojy1IOlrBWTb/zJX+A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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