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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbf9a7e21cef4e7e4b5e0d89a30765a9678f108ef0de6ad67d1b9a925f3d2b0' 
  AND token = 'IiHjF7tWVyMk2JibGyr/vuOXq1uqVfJ0bEsr1bxJwzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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