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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7ac6a6c29268f9a86690c14b868ffdcdc16aba3222e6d8eaf13d0c6dbe50b8' 
  AND token = 'Hw6qwk7SdTBsECKB81BUATR66hez3U3Yv2legTRYGp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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