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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ceedee3e61fceaa217681726e557789ec2256c9abdcb4a5d9e511d2c441eefc' 
  AND token = 'x6ZP1mziNeJXQaHVJYLuswoK8gA0UGlZsEVeNvWqnkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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