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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c0029fc30fa35d4321e7f42ea0e20fcae7eff0d9fd10ff89cf283ec603c0b3' 
  AND token = 'iGZ1Sb6igFy9/eUvTTlrH+SOtj9PmoMMI5/+O7iEJQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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