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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254977a993cd49763c7d18426afce9cb1b3c9b897e28ed9ad0979dedb1e52c12' 
  AND token = 'jSVG/EWq9FfMPnRfAhcCl9tJXkGK3nxvX0eI8lK6m9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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