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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13d959b7632e7c1da893d38bd79eec21e23ca8ee43e312cba33a595f97a7704' 
  AND token = 'CA6nb/uvdix7coYCNopMuzIrNRyWyLCZVA6V4LzYyQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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