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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36a408c2de98034206a0fcf361814f319b926e383c11647f172334e82a69497' 
  AND token = 'bE7Bx4AI5Fx/wHe+TTB4vVwRVFWImbH6JTN3O33aW6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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