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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd569c18a995503d106a0f665160393fa964a7e177f4e3eaf6ad942b7031f0e63' 
  AND token = '8WdZCaYOq2ht+I0z2HcqQvuKoM6vF38G6XnInkYZl+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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