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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc3075022e33fe8c0cc385843f6870709f7e0d1b14885933f394d2788732fbe' 
  AND token = 'J/QYbYfIgbXfsjdw7tpcjUoPrU/xnoQmka6WK5bKIwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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