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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfa0cfd557f1daebed506f1306279868cbff5db81b8845932b5083d1c0ab85d' 
  AND token = '4Tg0NB90KJSH2/icCb9iPkzCLcQxZRGd9N/HF3Ez+jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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