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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c207c6cd5c39b8278bc25709d09e9a8884a38934fd27ccd68ef338433ad6b8b' 
  AND token = '7d5EKAQDBnHHGoQrJI4yg22INR10uQcVWvL4Sfl+5l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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