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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8084ce2fdd8e287c76428455ccc848505793debdcb05af48115ec675c74a860d' 
  AND token = 'KqjG/4SRFdZa1eJi//2g67Bp2EOyP1ppuq9DKtypWvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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