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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df03eca8c8ceca3da54386087414da9c41e8142795c10dab2c1983c46a52b5e' 
  AND token = 'gqICMw8cB6a+PzjqYHX6/7kuwh0q+bqEx6ktxXWHrCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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