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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074c42b8c916bf0a0ae3d82afac2da9d736ccb6446b40f192952ee6fa5a52f93' 
  AND token = '/8u58w3mnuw8K2vI0F5KwrAkffkEJ63FsEwksm7zfvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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