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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fca33e7e517ce0caca9def0c064be3ac6be5eee1171c48878e2a7050e8dfc6' 
  AND token = '+PCsafyIvPnDgZE0UvTCM6PRAlwypOG//yWin9ao2Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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