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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e8fd1b5b4abbd0e0025a1f97c33806b8b8361383a4c6467100d65ecc1781fc' 
  AND token = 'cbIjWmMQWT1hhtTDcaU6WNymxD+J7RS01R6dmd7pkXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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