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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dad9c4260563b699d9ded7b0d275740df09b4295b858d37c3f66f84e44af01' 
  AND token = 'qm0jSku19H/OZ62ZNRB4Z9lCwjoOVofCbIrYmIs6O2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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