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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d952258c3127adce26c6d6bcb17ca1332e2b7efa9ecc9fe2b9793d480798714' 
  AND token = 'IX6URSlQeYJhQpromBKSkPaTxifk9XI4Bj3/sZkW7X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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