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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5716c3799fda8ded1bb89c700fc573e919435510361593e4a2f6448ad533465d' 
  AND token = 'TwWdXz8M9BRu4gfskzam4lXYPKrKhBe9RpiQU1476GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00199

JSON explain

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