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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239f0a347f3820c03f355bdd2501e4f4109c3361eb5e4f2e33945ad734776354' 
  AND token = '9nYgi++3I/23Z3nsEzE+wmP2P4tkbfbqk2t1sdT11tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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