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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b375fc2df9eab91a2f55c1d9b45faaaf03e122e06b6d2e64aef18091a802537' 
  AND token = '18QNcp498CmV0CWnWQ4Qs0vobux18PxuzVkNtZe60X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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