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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94194f8467cfee600777d8a0a04ca041135e2bb4ee5e04cad22c45f9879c0808' 
  AND token = 'Ckj3iuhIRrxOMJtPTYPlXEd410gBN2O0GdWyOl7lt/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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