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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864c7658be2bab5efac41bbf592d1f49f7b35929bbc9a9934852709d14513b10' 
  AND token = '6IXsWbxknQBs3/vG2JnVsrFg81kytL17hxDeUdfknW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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