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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74859b9475ee4c283730973c68f9303990d781f17070fe6c60f134700f2dad32' 
  AND token = 'FRlvLo5tzMT8XUeJW4xuDfrv431wkDDpxL/gKu1tEus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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