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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666f586f946be80d51529ed8610a0c6034dee4b6517fa83b4bcc600cde3bb82e' 
  AND token = 'uuhTwL1QF/W8CAGExERMImG3OE2W142VTMLli08l6WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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