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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e215cd15b379ffd6cbff78b117b7f8fd8e6202a6a0ab779d67587a69ddbb9696' 
  AND token = '7j5nQ+KTezz9eI0jdboOxPrz91G6mK8bxnVSnhTStsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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