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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a47c021c35abbe017c4b7f3af2aee8ef31f9c6206343f20840240d3bf5c7902' 
  AND token = 'u9YU0xreu4lYOCNpOkphxb8iYUhtv4uoV8I5Rkv2ZTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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