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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c46a107757b61f42e0c8a1b831ab5a01ae107d1aad6bb7be31a0fd3c257c80' 
  AND token = '08e97DYcFT7CADQcHUI8MRqSKYGQ4qx6ziVE3IRnA7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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