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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f2561f414f970f30c5a15d4a51ae042a42b96b08c7a495fc1f843646dee90c' 
  AND token = '6NRmCeSN9+t9kpGfO8HVgTaEccgR9He0MLBo+bgvF84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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