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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620bc4c6b8ac8953cf46b62dd58a8d15ce9a680ae2d994cd081ee7f7750ca4b6' 
  AND token = 'cskGRcDBBqsooB76UMQkfuN9an5v0R0c1ombgEanRmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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