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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ca2dcfe8ebce6c76d8444b7a1d0cd3ce4a28f1f8f3d3711db0f6eef99061b2' 
  AND token = '6bSQ4pJU7UtWI+inPO0p/ZNEF5yal2np7PP30KLnfGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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