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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14db529ca916d36b2c639999316079ccbfee14aedad4ab7f0e0c8b3931930bbe' 
  AND token = 'JCDD4/e6yUwcAyAWYVKolXEuLhLEP4x1p4HSmvG94JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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