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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7030e18a5b97a53462f6fda56748551834440c9bd058e34b0d76cfb2460bfae7' 
  AND token = 'BoCFzCpD6l8awCqa+b8gRlLkD7id7G9DRiv07KOEI3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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