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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79517dbfda7a22ee4fd3c73a5ef01417f00c9e622f1fdc7c22551d7264b03e6f' 
  AND token = 'K3pFOCdjnjrcEDEndNbmpLnYqfbyO/jK51djZb+wr5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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