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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40614b850790ac25f010c9dcc206ac36e52080b5605d7cf5c45af5d3585d2a3c' 
  AND token = 'az+NgbKgp67xp6mWYCe0lK+yIr5ek2qjXdT/373AJCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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