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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94baad126a9faa6ef2d5cc0ef9578626dde61a60c31e523cf16bb45fd4a1f4d0' 
  AND token = '9gXIIZGT0XmyvtnR7ffqoJi+Xdru3ZLGXDIzEQXbRzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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