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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b178e183056d554ebea771dfad443c41f6fc54e90ca33ef8487b9639467e6ed0' 
  AND token = 'gcyhJbFkq6amk2BroOmV5NZm2WEQGLDX5C7rv2HVIHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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