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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68401aee93414998c766c5e921098c58ed58a2a9365ae100e931b44c3409d16' 
  AND token = 'ediO/Xk5PZcklVNTOP0mUr/3cSmxt/d3HAPlyAG3f2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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