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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afca9e806090986463ae2d7d69867e0bd60ca29b5b442169460107ecdf379c7' 
  AND token = 'gktFrfyReWa4wS9/Uw16AU0G9ZoUdTxlFu68mlKgna8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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