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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cbb6cc66ee861890ce4613ea4489c11f42aa9e33700d453fb98c027c4062d9' 
  AND token = '1SkoheZ0Dr8sLa+MycTsEg9/mBhkRfdohH0/JQHJlEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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