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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b14e1d766bd8682d3171d2f9812eca297c0807148807cb2de32cd81e47763b0' 
  AND token = '8Cuob98ldOwAEr8hxn8hz/0cZqAoz+Iz6YttDjFcfxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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