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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a97b5443266e417c07db5b39286fa5ffc9a364bfd07b381967f50f3c2556d61' 
  AND token = 'fAKxQcYolx6HyNm5lPvRK4kNCflAobj1SKTI1GW0KqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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