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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68f9c928af3d1e4a503a9d055789a2b0eabed03e86c80f79d52fb536d84de6' 
  AND token = 'DCJg3R2Qq3iDRS3FZ6/XoUhb7/tor0FOWpU/P5snlCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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