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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cb35dca7604d89b0e220e0c124d4b4872407771fdf076b9aead68c00452404' 
  AND token = 'f3oXlsPhgMSXqZr0Q4A2yjq/cZ3f9LTsArnNK3uBhrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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