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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7e560b639def2db39e4f9414ff5b3ef68eede351cae752890ca3d391963e1b' 
  AND token = 'B57M1/lAYm6L/stx6K7tLkjhvqJrHFFdvUXcOFB94z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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