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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc8f48e21a311ee0900b4d059352303c73243a15f76fe6204f672ddc39f013c' 
  AND token = 'OMwxlLlpXlfXDJfF5Bkb7d8aC2HtH3+ixNq7XoA+Jfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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