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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17cf9b9323e0b8179c687df9e085d905a8ce860ca0024d760e003a0c824bac0' 
  AND token = '3Ul0XR+/0Kxq5Qt9nqYGDmt3L71bhtZcF53Sa81mfY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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