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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e63b66dcab2dd6cfa651c7eb2dbc58d395a811586310da415e698dfd09e04fd' 
  AND token = 's74oYTWela77xyNONRp834OmPYmKp8Hd+Xq7TmE7XLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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