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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058190a31e2dce83c839ed0d5327a4e805070d80962f8585a38f81a3da02a452' 
  AND token = '/+ClKV8VUOr7U9XRU+8Uad/f4YjFwXNWTeOQSFWhtNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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