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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13ad17b974a16b04b4c55a9585da09d6c07e866afe484a811a5ae084b58b322' 
  AND token = 'mT6goPNm28A7AdfXW0aF3+l3zPE7uB3P8WgzmpG620c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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