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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2692d4b354dc50319f0cb68198e9e64ab29f45e7ce78b1f70bddc3aaaf7c854f' 
  AND token = 'delLPASjd2NOahf8I3OzypsvRR86+HM/v2MQVIeS9Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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