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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff44235ed7b563282cbb404930c29beba641f33cab98968bbc696a69b8de0955' 
  AND token = 'Ux/YQ5MdROlynE/1T4dktMZmriil9FrV9YKUCSkrI9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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