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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2dddf0d256777b6ecc4d19770bb51086e78ae2b936ce0ab9f3e844d284f82b' 
  AND token = '8sikcIUKfNAxW/KpwzE8dtTXErC9+3xq/S2ypZwPBR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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